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Finding the Fourth Proportional to 678.22, 1,013.01 and 613.11

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Solution

The fourth proportional to 678.22, 1,013.01 and 613.11 is: 915.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.22 : 1,013.01 = 613.11 : x
  2. Step 2: Convert to fraction form
    678.22/1,013.01 = 613.11/x
  3. Step 3: Cross multiply
    678.22x = 1,013.01 × 613.11
  4. Step 4: Simplify right side
    678.22x = 621,086.56
  5. Step 5: Solve for x
    x = 621,086.56/678.22
  6. Step 6: Final answer
    x = 915.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.